Smithsonian miscellaneous collections . RECENT Lytechinusvariegatusvariegatus Clypeaster subdepressus nfliiiiirii Clypeaster crassus Clypeaster rosoceus dalli Encope michelini imperforata. Rhyncholornpas ayres[MMHBBBHBMHBI Clypeasterprostratus Clypeaster rosaceus rosaceus Encopemichelinimichelini Fig. 1.—Suggested lineages of some of the species. 6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 145 is little room for difference of opinion as to what species should beincluded in this report. In his description of the echinoids of theBarbados-Antigua expedition, Clark (1921, p. 103-104) consideredLy
Smithsonian miscellaneous collections . RECENT Lytechinusvariegatusvariegatus Clypeaster subdepressus nfliiiiirii Clypeaster crassus Clypeaster rosoceus dalli Encope michelini imperforata. Rhyncholornpas ayres[MMHBBBHBMHBI Clypeasterprostratus Clypeaster rosaceus rosaceus Encopemichelinimichelini Fig. 1.—Suggested lineages of some of the species. 6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 145 is little room for difference of opinion as to what species should beincluded in this report. In his description of the echinoids of theBarbados-Antigua expedition, Clark (1921, p. 103-104) consideredLytechinus variegatus, Echinometra lucunter, and Clypeaster rosa-ceus as strictly littoral and as those species which occur alongshore, or on reefs easily accessible at low tide. According to Sharp and Gray (1962, p. 313), Lytechinus variega-tus off North Carolina is most common in shallow water on sandybottoms where there is material for protective covering and wherewave action is at a minimum. They found the small adhesive discsof the tube-feet of this species inadequate for withstanding evenmoderately heavy wave action. Clark (1933, p. 81) reported thatoff Puerto Rico L. variega
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